Workbench: Optimize Shadows.

This makes the shadows ~10 times faster in the general case.

This only create extrusion geometry on the outline edges. Also we increment
or decrement the stencil buffer by 2 for each manifold edge and only by 1
for non manifold. This make the algorithm robust yet less heavy than creating
one prism for each triangles.

1 files changed, 5 insertions, 2 deletions

diff --git a/source/blender/draw/engines/workbench/workbench_materials.c b/source/blender/draw/engines/workbench/workbench_materials.c
index 1dcc8d0ec6d..944572729c1 100644
--- a/source/blender/draw/engines/workbench/workbench_materials.c
+++ b/source/blender/draw/engines/workbench/workbench_materials.c
@@ -620,10 +620,13 @@ void workbench_materials_solid_cache_populate(WORKBENCH_Data *vedata, Object *ob
 		}
 
 		if (SHADOW_ENABLED(wpd) && (ob->display.flag & OB_SHOW_SHADOW) > 0) {
-			struct Gwn_Batch *geom_shadow = DRW_cache_object_surface_get(ob);
+			struct Gwn_Batch *geom_shadow = DRW_cache_object_edge_detection_get(ob);
 			if (geom_shadow) {
 				if (is_sculpt_mode) {
-					DRW_shgroup_call_sculpt_add(wpd->shadow_shgrp, ob, ob->obmat);
+					/* Currently unsupported in sculpt mode. We could revert to the slow
+					 * method in this case but i'm not sure if it's a good idea given that
+					 * sculped meshes are heavy to begin with. */
+					// DRW_shgroup_call_sculpt_add(wpd->shadow_shgrp, ob, ob->obmat);
 				}
 				else {
 					DRW_shgroup_call_object_add(wpd->shadow_shgrp, geom_shadow, ob);